What is a good phone, iPhone 5, Samsung Galaxy S2, or Samsung Galaxy S3?

I need a new phone and I'm wondering which I should get. My friend is selling his GS2 for around 50 Bucks and I could possibly get an iPhone 5 or Galaxy S3. Can you tell me the prices with and without the plan. And for people that have these phones could you tell me how good it is and which carrier(Sprint, Verizon, At&T)?

I just upgraded to the iphone 5, and its amazing.personally, i prefer iphone over any of the other smartphones. Just a better system in general. I had the S2 and it sucked. I know people who have the S3 and they say it isn't very good. Iphone 5 is 200 bucks with 2year contract, and 630 without it.

IPhone 5. Its actually an amazing phone, i got the white one and its amazing.speed wise, camera, how it looks, speakers are LOUD! IPhone is also one of the most secure phones around

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